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170 lines
8.3 KiB
170 lines
8.3 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/canvas/qcanvas.cpp:4671 -->
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<title>QCanvasEllipse Class</title>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QCanvasEllipse Class Reference<br><small>[<a href="canvas.html">canvas module</a>]</small></h1>
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<p>The QCanvasEllipse class provides an ellipse or ellipse segment on a QCanvas.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qcanvas-h.html">qcanvas.h</a>></tt>
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<p>Inherits <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>.
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<p><a href="qcanvasellipse-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QCanvasEllipse"><b>QCanvasEllipse</b></a> ( QCanvas * canvas )</li>
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<li class=fn><a href="#QCanvasEllipse-2"><b>QCanvasEllipse</b></a> ( int width, int height, QCanvas * canvas )</li>
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<li class=fn><a href="#QCanvasEllipse-3"><b>QCanvasEllipse</b></a> ( int width, int height, int startangle, int angle, QCanvas * canvas )</li>
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<li class=fn><a href="#~QCanvasEllipse"><b>~QCanvasEllipse</b></a> ()</li>
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<li class=fn>int <a href="#width"><b>width</b></a> () const</li>
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<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
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<li class=fn>void <a href="#setSize"><b>setSize</b></a> ( int width, int height )</li>
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<li class=fn>void <a href="#setAngles"><b>setAngles</b></a> ( int start, int length )</li>
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<li class=fn>int <a href="#angleStart"><b>angleStart</b></a> () const</li>
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<li class=fn>int <a href="#angleLength"><b>angleLength</b></a> () const</li>
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<li class=fn>virtual int <a href="#rtti"><b>rtti</b></a> () const</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual void <a href="#drawShape"><b>drawShape</b></a> ( QPainter & p )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QCanvasEllipse class provides an ellipse or ellipse segment on a <a href="qcanvas.html">QCanvas</a>.
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<p>
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<p> A canvas item that paints an ellipse or ellipse segment with a <a href="qbrush.html">QBrush</a>.
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The ellipse's height, width, start angle and angle length can be set
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at construction time. The size can be changed at runtime with
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<a href="#setSize">setSize</a>(), and the angles can be changed (if you're displaying an
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ellipse segment rather than a whole ellipse) with <a href="#setAngles">setAngles</a>().
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<p> Note that angles are specified in 16ths of a degree.
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<p> <a name="anglediagram"></a>
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<center><img src="qcanvasellipse.png" alt="Ellipse"></center>
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<p> If a start angle and length angle are set then an ellipse segment
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will be drawn. The start angle is the angle that goes from zero in a
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counter-clockwise direction (shown in green in the diagram). The
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length angle is the angle from the start angle in a
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counter-clockwise direction (shown in blue in the diagram). The blue
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segment is the segment of the ellipse that would be drawn. If no
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start angle and length angle are specified the entire ellipse is
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drawn.
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<p> The ellipse can be drawn on a painter with <a href="#drawShape">drawShape</a>().
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<p> Like any other canvas item ellipses can be moved with <a href="qcanvasitem.html#move">move</a>() and
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<a href="qcanvasitem.html#moveBy">moveBy</a>(), or by setting coordinates with <a href="qcanvasitem.html#setX">setX</a>(), <a href="qcanvasitem.html#setY">setY</a>() and <a href="qcanvasitem.html#setZ">setZ</a>().
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<p> Note: QCanvasEllipse does not use the pen.
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<p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QCanvasEllipse"></a>QCanvasEllipse::QCanvasEllipse ( <a href="qcanvas.html">QCanvas</a> * canvas )
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</h3>
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Constructs a 32x32 ellipse, centered at (0, 0) on <em>canvas</em>.
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<h3 class=fn><a name="QCanvasEllipse-2"></a>QCanvasEllipse::QCanvasEllipse ( int width, int height, <a href="qcanvas.html">QCanvas</a> * canvas )
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</h3>
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Constructs a <em>width</em> by <em>height</em> pixel ellipse, centered at
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(0, 0) on <em>canvas</em>.
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<h3 class=fn><a name="QCanvasEllipse-3"></a>QCanvasEllipse::QCanvasEllipse ( int width, int height, int startangle, int angle, <a href="qcanvas.html">QCanvas</a> * canvas )
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</h3>
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Constructs a <em>width</em> by <em>height</em> pixel ellipse, centered at
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(0, 0) on <em>canvas</em>. Only a segment of the ellipse is drawn,
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starting at angle <em>startangle</em>, and extending for angle <em>angle</em>
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(the angle length).
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<p> Note that angles are specified in
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<small><sup>1</sup>/<sub>16</sub></small>ths of a degree.
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<h3 class=fn><a name="~QCanvasEllipse"></a>QCanvasEllipse::~QCanvasEllipse ()
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</h3>
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Destroys the ellipse.
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<h3 class=fn>int <a name="angleLength"></a>QCanvasEllipse::angleLength () const
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</h3>
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<p> Returns the length angle (the extent of the ellipse segment) in
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16ths of a degree. Initially this will be 360 * 16 (a complete
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ellipse).
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<p> <p>See also <a href="#setAngles">setAngles</a>() and <a href="#angleStart">angleStart</a>().
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<h3 class=fn>int <a name="angleStart"></a>QCanvasEllipse::angleStart () const
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</h3>
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<p> Returns the start angle in 16ths of a degree. Initially
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this will be 0.
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<p> <p>See also <a href="#setAngles">setAngles</a>() and <a href="#angleLength">angleLength</a>().
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<h3 class=fn>void <a name="drawShape"></a>QCanvasEllipse::drawShape ( <a href="qpainter.html">QPainter</a> & p )<tt> [virtual protected]</tt>
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</h3>
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Draws the ellipse, centered at <a href="qcanvasitem.html#x">x</a>(), <a href="qcanvasitem.html#y">y</a>() using the painter <em>p</em>.
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<p> Note that QCanvasEllipse does not support an outline (the pen is
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always NoPen).
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<p>Reimplemented from <a href="qcanvaspolygonalitem.html#drawShape">QCanvasPolygonalItem</a>.
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<h3 class=fn>int <a name="height"></a>QCanvasEllipse::height () const
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</h3>
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Returns the height of the ellipse.
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<h3 class=fn>int <a name="rtti"></a>QCanvasEllipse::rtti () const<tt> [virtual]</tt>
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</h3>
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Returns 6 (QCanvasItem::Rtti_Ellipse).
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<p> <p>See also <a href="qcanvasitem.html#rtti">QCanvasItem::rtti</a>().
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<p>Reimplemented from <a href="qcanvaspolygonalitem.html#rtti">QCanvasPolygonalItem</a>.
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<h3 class=fn>void <a name="setAngles"></a>QCanvasEllipse::setAngles ( int start, int length )
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</h3>
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Sets the angles for the ellipse. The start angle is <em>start</em> and
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the extent of the segment is <em>length</em> (the angle length) from the
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<em>start</em>. The angles are specified in 16ths of a degree. By
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default the ellipse will start at 0 and have an angle length of
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360 * 16 (a complete ellipse).
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<p> <p>See also <a href="#angleStart">angleStart</a>() and <a href="#angleLength">angleLength</a>().
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<h3 class=fn>void <a name="setSize"></a>QCanvasEllipse::setSize ( int width, int height )
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</h3>
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Sets the <em>width</em> and <em>height</em> of the ellipse.
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<h3 class=fn>int <a name="width"></a>QCanvasEllipse::width () const
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</h3>
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Returns the width of the ellipse.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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